INCIDENCE OF ROOT-ROT AND WILT DISEASE COMPLEX OF OLIVE TREES IN NEW VALLEY GOVERNORATE IN EGYPT AND ITS CONTROL
A.E. Hassan, M., E.A. El-Morsi, M., E.A. Abo Rehab, M., M. Radwan, F. (2009). INCIDENCE OF ROOT-ROT AND WILT DISEASE COMPLEX OF OLIVE TREES IN NEW VALLEY GOVERNORATE IN EGYPT AND ITS CONTROL. EKB Journal Management System, 40(1), 105-124. doi: 10.21608/ajas.2009.268648
M. A.E. Hassan; M E.A. El-Morsi; M. E.A. Abo Rehab; Fatma M. Radwan. "INCIDENCE OF ROOT-ROT AND WILT DISEASE COMPLEX OF OLIVE TREES IN NEW VALLEY GOVERNORATE IN EGYPT AND ITS CONTROL". EKB Journal Management System, 40, 1, 2009, 105-124. doi: 10.21608/ajas.2009.268648
A.E. Hassan, M., E.A. El-Morsi, M., E.A. Abo Rehab, M., M. Radwan, F. (2009). 'INCIDENCE OF ROOT-ROT AND WILT DISEASE COMPLEX OF OLIVE TREES IN NEW VALLEY GOVERNORATE IN EGYPT AND ITS CONTROL', EKB Journal Management System, 40(1), pp. 105-124. doi: 10.21608/ajas.2009.268648
A.E. Hassan, M., E.A. El-Morsi, M., E.A. Abo Rehab, M., M. Radwan, F. INCIDENCE OF ROOT-ROT AND WILT DISEASE COMPLEX OF OLIVE TREES IN NEW VALLEY GOVERNORATE IN EGYPT AND ITS CONTROL. EKB Journal Management System, 2009; 40(1): 105-124. doi: 10.21608/ajas.2009.268648

INCIDENCE OF ROOT-ROT AND WILT DISEASE COMPLEX OF OLIVE TREES IN NEW VALLEY GOVERNORATE IN EGYPT AND ITS CONTROL

Assiut Journal of Agricultural Sciences
Article 8, Volume 40, Issue 1, March 2009, Page 105-124  XML PDF (366.04 K)
Document Type: Original Article
DOI: 10.21608/ajas.2009.268648
View on SCiNiTO View on SCiNiTO
Authors
M. A.E. Hassan1; M E.A. El-Morsi2; M. E.A. Abo Rehab2; Fatma M. Radwan2
1Plant Pathology Department, Faculty of Agriculture, Assiut University, Assiut, Egypt
2Plant Pathology Research Institute, Agric. Res. Center, Giza, 72514, Egypt
Abstract
Root rot and wilt disease complex was detected in different olive tree orchards at El-Kharga, Paris, El-Dakhla and El-Farafrah oases of the New Valley Governorate. Percentage of disease incidence and severity on olive trees in surveyed districts were differed. The average percentage of disease incidence and severity of root rots and wilt disease in surveyed districts were 27.7-54.1% and 35.4-60.3%, respectively. The most frequent isolated fungi from rotted roots of olive trees were Fusarium oxysporum, F. solani, F. moniliforme, F. equiseti and Rhizoctonia solani, while Macrophomina phaseolina, Cylindrocarpon sp < /em>., Acremonium egyptina, Chaetomium olivaceum and Nigrospora oryzae were isolated in less frequency. Frequency of the isolated fungi varied between locations. Fusarium oxysporum was most frequent at all locations, followed by F. solani and R. solani. All the tested fungi were pathogenic to olive transplants, Fusarium oxysporum, F. solani and Rhizoctonia. solani caused the highest root rots incidence and severity. However, Acremonium egyptina, Chaetomium olivaceum and Nigrospora oryzae were non-pathogenic. Efficiency of six different fungicides (Kema-Z, Maxim XL, Rizolex T, Ridomil gold plus, Moncut and Topsin M70) for reducing growth of the tested pathogenic fungi and controlling the disease was studied in vitro and in vivo experiments. Complete inhibition of mycelial growth of the tested fungi was obtained at 50-200 ppm concentrations of Kema-Z, Maxim XL Rizolex-T and Topsin M70, while, the Moncut fungicide completely inhibited the growth of the tested fungi at 100 ppm concentrations. Maxim XL, Rizolex-T and Topsin M70 gave the highest reduction in disease incidence, while, Ridomil gold plus gave the least reduction in disease incidence. Efficiency of Humic acid, as soil drench treatment, varied in reducing incidence of root rot and wilt. Humic acid treatment reduced disease incidence especially when used at 2 and 3% against F. oxysporium, F. solani and Rhizoctonia solani.
Keywords
Olive trees; transplants; root rot and wilt disease complex; Fungicides; Humic acid
Supplementary Files
Statistics
Article View: 369
PDF Download: 265